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J a <br /> PUBLIC`HEALTH SERNqCES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer `s <br /> 445 N. San Joaquin Street • P.O. Box 388 a Stockton, CA 95201-0388 <br /> (209) 468-3420 <br /> C (OMDY <br /> ARTHUR L WYATT, JR <br /> 6290 CHESAPEAKE CR <br /> STOCKTON CA 95209 ,IUL 111994 <br /> RE: ARCO MINI MART <br /> 4511 PACIFIC AVENUE; STOCKTON SITE CODE: 1216 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> completed review of the fourth quarter monitoring report for 1993, and the first quarter <br /> monitoring report for 1994. <br /> The facility has recently undergone replacement of the underground storage tanks to <br /> accommodate new dual-wailed tanks. During the tank replacement activity April 8, 1994, <br /> petroleum hydrocarbon impacted soil was observed and documented near the center area of <br /> the tank pit, the eastern end of the tank pit, and in the pipeline locations denoted as P-2, P-3, <br /> and P-5. <br /> Pursuant to the recommendation and conclusion of the March 1994 "Quarterly Report" and <br /> the April 30, 1994 "Underground Storage Tank Removal Report", PHS/EHD agrees that <br /> petroleum hydrocarbons still present at the site continue to pose a potential threat the water <br /> quality. Therefore, a Corrective Action Plan (CAP) is to be developed from the information <br /> obtained during the soil and groundwater investigation phase. <br /> The Corrective Action Plan shall include an assessment of the physical and chemical <br /> characteristics of the hazardous substance(s) and/or constituents, including their toxicity, <br /> persistence and potential for migration in water, soil, and air; the hydrogeologic characteristics <br /> of the site and the surrounding area where the release has migrated or may migrate; and, the <br /> proximity and quality of nearby surface water or groundwater, and the current and potential <br /> beneficial uses of these waters. as well as the potential effects of residual contamination on <br /> nearby surface water and/or groundwater. <br /> A feasibility study shall evaluate alternatives for remedying or mitigating the actual or <br /> potential adverse effects of the release. Each alternative shall be evaluated for cost- <br /> effectiveness, and the study shall propose to implement the most cost-effective corrective <br /> action. The Central Valley Regional Water Quality Control Board's (RWQCB) Basin Plan <br /> has designated all surface water and groundwater as current or potential beneficial use. <br /> Therefore, the feasibility study should also identify and evaluate at least two alternatives for <br /> restoring or protecting these beneficial uses. <br /> A fh%ision of San Joaquin County Health Care Services <br />